不同垂直颅面结构安氏Ⅱ~1类错嚼肌肌电活动变化  

THE CHANGES OF ELECTROMYGRAPHIC ACTIVITY OF MASTICATORY MUSCLES IN CLASS Ⅱ~1 MALOCCLUSIONS WITH DIFFERENT VERTICAL CRANIOFACIAL MORPHOLOGY

作　　者：李海涛[1] 崔传江 卢恕来[3] 何开云[1] 

机构地区：[1]青岛大学医学院,山东青岛266021 [2]青岛市口腔医院修复科 [3]青岛市市立医院口腔科

出　　处：《青岛大学医学院学报》2010年第1期32-34,共3页Acta Academiae Medicinae Qingdao Universitatis

摘　　要：目的探讨安氏Ⅱ1类错畸形垂直颅面结构变化与嚼肌肌电活动的关系。方法选取31例安氏Ⅱ1类错女大学生(高角8例、均角13例、低角10例)和5例正常均角型女大学生。用Keypoint四道数字化肌电图仪同步记录姿势位、最大紧咬位、最大前伸位时嚼肌的肌电活动,比较嚼肌肌电活动差异。结果姿势位时,嚼肌肌电活动均无明显差别;最大紧咬位时安氏Ⅱ1类错均角组肌电活动低于正常(t=2.38,P<0.05),最大前伸位时安氏Ⅱ1类错均角组的嚼肌的肌电活动显著高于正常(t=2.51,P<0.05);最大紧咬位时安氏Ⅱ1类错高角组嚼肌的肌电幅值低于均角组和低角组(F=7.19,q=5.35、3.47,P<0.05);最大前伸位时安氏Ⅱ1类错高角组嚼肌肌电活动较低角组弱(F=9.83,q=4.78,P<0.05)。结论不同垂直颅面结构安氏Ⅱ1类错的嚼肌肌电活动有所不同;嚼肌的肌电活动与颅面结构有关。Objective To study the relationship between different vertical craniofacial morphology and EMG activities of mastieatory muscles in Class Ⅱ1 malocclusions. Methods Thirty-one female undergraduate students with Class Ⅱ1 malocclusions （eight cases with high angle, 13 with normal-angle, 10 with low-angle） and five with normal occlusion and normal-angle were included in this study. A computer-integrated Keypoint Ⅳ diagnostic system was used to syn chronously record EMG activity of the masticatory muscle under relaxing, under maximal clenching and maximal protruding condition. Differences of EMG activity were recorded. Results There was no significant difference in resting EMG activity. Compared with the masticatory muscle EMG activity in normal occlusion （normal angle）, the mastieatory muscle EMG activity in Class Ⅱ1 malocelusions （normal angle） individuals was significantly lower than that of normal occlusion （normal-angle） during maximal clenching condition （t= 2.38, P〈0.05）, but were significantly higher than that of normal occlusion （normal angle） during maximal protruding condition （t =2. 51, P〈 0.05）. In the inter group comparison, the masticatory muscle EMG activity in Class Ⅱ1 malocclusions with high-angle was significantly lower than that of normal-angle and low-angle during maximal clenching condition （F=7.19;q=5.35,3.47;P〈0.05） and lower than that of low angle during maximal protruding condition （F=9.83,q=4. 78, P〈0. 05）. Conclusion EMG activity of the mastieatory muscles is different based on the Class Ⅱ1 malocclusions with different vertical craniofacial morphology. EMG activity of the masticatory muscle is associated with the and craniofacial morphology.

关 键 词：错[牙合] 安氏Ⅱ类 咀嚼肌 肌电描记术 颅面结构 

分 类 号：R783[医药卫生—口腔医学]